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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The deltoid is the large muscle that covers your shoulder joint. The muscle consists of three fiber groups: the anterior, lateral and posterior deltoids. The anterior deltoid, also known as the front delt, connects the collarbone to the humerus, the large bone of the upper arm.houlder Abduction. Shoulder abduction describes raising the upper arm outward from the side of the body, such as when you put your arms out to form a T-shape. This movement is accomplished through the action of your anterior and lateral deltoids along with the pectoralis major and supraspinatus muscles.